Morgan V. Frawley, 25, of Fairfield, pleaded not guilty Thursday to second-degree sexual assault. The former youth group leader used to work at the Congregational Church of New Canaan, Conn., when, according to police, she had a sexual relationship with a 15-year-old boy who belonged to her group.

The Fairfield woman who police said had sexual relations with a 15-year-old boy while working at the Congregational Church of New Canaan pleaded not guilty in Norwalk Superior Court Thursday to second-degree sexual assault.

Morgan Frawley, 25, is also facing a charge of risk of injury to a minor, to which she already had pleaded not guilty.

New Canaan police arrested Frawley Oct. 25 after an investigation concluded that the former church youth group leader exchanged numerous sexually explicit photos and text messages with the teenage boy.

In January, she was found eligible for accelerated rehabilitation, a probationary program for first-time offenders that, if completed, would expunge the charges against her. But after a sexual assault charge was added Feb. 21, Frawley is no longer qualified. By law, a person is ineligible for the program if he or she is charged with Class B felony, which includes second-degree sexual assault.

After a request from Frawley's attorney, Frank Bevilacqua, Norwalk Superior Court continues the case to April 29.

Frawley had been working part time as a youth group leader at the New Canaan church for two years before she was suspended last April. She was not a member of the church, according to church officials.

The suspension came after church leaders were notified by the boy's parents about explicit text messages between Frawley and the teen on his cellphone. The church then reported the alleged relationship to the state Department of Children and Families, which contacted New Canaan police the same day, according to the Oct. 16 affidavit.

Frawley also was an eighth-grade substitute teacher at Tomlinson Middle School in Fairfield. She was dismissed by the school in last April, immediately after officials learned of the allegations against her, according to the affidavit.

New Canaan Police Sgt. Carol Ogrinc wrote in the affidavit that she believed "Frawley and the juvenile victim were involved in a sexual relationship and engaged in sexual intercourse." Based on the text messages, Ogrinc believes that Frawley had been at the boy's residence and had sex, according to the document. Besides sexually explicit text messages, the affidavit shows that Frawley also sent multiple photos of herself to the victim in "suggestive poses while either partially clothed or fully nude."

A protective order prohibiting contact with the teen boy was issued against Frawley on Nov. 5.